/******************************************************************************
 * @file     main.c
 * @version  V1.00
 * $Revision: 1 $
 * $Date: 17/07/19 6:46p $
 * @brief    Sample code for GPIO Power-down Wake-up feature.
 * @note
 * Copyright (C) 2017 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "NM1120.h"


void SYS_Init(void)
{
    /* Unlock protected registers */
    SYS_UnlockReg();

    /* Enable 48MHz HIRC */
    CLK->PWRCTL = CLK->PWRCTL | CLK_PWRCTL_HIRCEN_Msk;

    /* Waiting for 48MHz clock ready */
    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);

    /* HCLK Clock source from HIRC */
    CLK->CLKSEL0 = CLK->CLKSEL0 | CLK_HCLK_SRC_HIRC;

    /* Enable USCI0 IP clock */
    CLK->APBCLK = CLK->APBCLK | CLK_APBCLK_USCI0CKEN_Msk;

    /* Update System Core Clock */
    /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and cyclesPerUs automatically. */
    SystemCoreClockUpdate();

    /* USCI-Uart0-GPD5(TX) + GPD6(RX) */
    /* Set GPD multi-function pins for USCI UART0 GPD5(TX) and GPD6(RX) */
    SYS->GPD_MFP = SYS->GPD_MFP & ~(SYS_GPD_MFP_PD5MFP_Msk | SYS_GPD_MFP_PD6MFP_Msk) | (SYS_GPD_MFP_PD5_UART0_TXD | SYS_GPD_MFP_PD6_UART0_RXD);

    /* Set GPD5 as output mode and GPD6 as Input mode */
    PD->MODE = PD->MODE & ~(GPIO_MODE_MODE5_Msk | GPIO_MODE_MODE6_Msk) | (GPIO_MODE_OUTPUT << GPIO_MODE_MODE5_Pos);

    /* Lock protected registers */
    SYS_LockReg();
}


/**
 * @brief       PortA/PortB/PortC/PortD IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The PortA/PortB/PortC/PortD default IRQ, declared in startup_NM1120.s.
 */
void GPABCD_IRQHandler(void)
{
    /* if(GPIO_GET_INT_FLAG(PB, BIT0)) */     /* To check if PB.0 interrupt occurred */
    if(PB->INTSRC & BIT0)
    {
        /* GPIO_CLR_INT_FLAG(PB, BIT0); */    /* Clear PB.0 interrupt flag */
        PB->INTSRC = BIT0;
        /* printf("PB.0 INT occurred. \n"); */
    }
    else
    {    /* Un-expected interrupt. Just clear all PORTA, PORTB, PORTC, PORTD interrupts */
        /* GPIO_CLR_INT_FLAG(PA, GPIO_GET_INT_FLAG(PA, 0x3F)); */
        PA->INTSRC = (PA->INTSRC & 0x3F);

        /* GPIO_CLR_INT_FLAG(PB, GPIO_GET_INT_FLAG(PB, 0x1F)); */
        PB->INTSRC = (PB->INTSRC & 0x1F);

        /* GPIO_CLR_INT_FLAG(PC, GPIO_GET_INT_FLAG(PC, 0x1F)); */
        PC->INTSRC = (PC->INTSRC & 0x1F);

        /* GPIO_CLR_INT_FLAG(PD, GPIO_GET_INT_FLAG(PD, 0x7F)); */
        PD->INTSRC = (PD->INTSRC & 0x7F);

        /* printf("Un-expected interrupts. \n"); */
    }
}


int main()
{
    SYS_Init();

    /* Init USCI UART0 to 115200-8n1 for print message */
    UUART_Open(UUART0, 115200);

    /* printf("\n\nPDID 0x%08X\n", SYS_ReadPDID()); */    /* Display PDID */
    printf("\n\nPDID 0x%08X\n", (unsigned int)(SYS->PDID & SYS_PDID_PDID_Msk)); /* Display PDID */

    printf("CPU @ %dHz\n", SystemCoreClock);        /* Display System Core Clock */

    /*
     * This sample code will demonstrate how to wake up system form Power-down mode
     * by GPIO interrupt.
     */
    printf("+--------------------------------------------+\n");
    printf("| NM1120 GPIO Power Down Wake Up Sample Code |\n");
    printf("+--------------------------------------------+\n");

    printf("Please keep PB.0 low and use rising edge to wake-up system ...\n");

    /* Config multiple function to GPIO mode for PB0 */
    SYS->GPB_MFP = (SYS->GPB_MFP & ~SYS_GPB_MFP_PB0MFP_Msk) | SYS_GPB_MFP_PB0_GPIO;

    /* GPIO_SetMode(PB, BIT0, GPIO_PMD_INPUT); */
    PB->MODE = (PB->MODE & ~GPIO_MODE_MODE0_Msk) | (GPIO_MODE_INPUT << GPIO_MODE_MODE0_Pos);

    NVIC_EnableIRQ(GP_IRQn);                    /* Enable GPIO NVIC */

    /* GPIO_EnableInt(PB, 0, GPIO_INT_RISING); */     /* Enable PB0 interrupt by rising edge trigger */
    PB->INTEN = (PB->INTEN & ~(GPIO_INT_BOTH_EDGE << 0)) | (GPIO_INT_RISING << 0);
    PB->INTTYPE = (PB->INTTYPE & ~(BIT0 << 0)) | (GPIO_INTTYPE_EDGE << 0);

    SYS_UnlockReg();

    /* Waiting for PB.0 rising-edge interrupt event */
    printf("Wait PB.0 to low\n");
    while(PB0 == 1);    /* wait PB.0 become low before get into power down mode */
    printf("Enter to Power-Down (rising-edge) ......  PB.0 = %d \n", PB0);

    /* UUART_WAIT_TX_EMPTY(UUART0); */  /* To check if all the debug messages are finished */
    while(!((UUART0->BUFSTS & UUART_BUFSTS_TXEMPTY_Msk) >> UUART_BUFSTS_TXEMPTY_Pos))

    CLK_PowerDown();

    printf("System waken-up done. PB.0 = %d\n\n", PB0);
    SYS_LockReg();
    printf("=== THE END ===\n\n");
    while(1);
}

/*** (C) COPYRIGHT 2017 Nuvoton Technology Corp. ***/
